Solipsism

Excessive regard for oneself and one’s own interests, to the exclusion of others; preoccupation with oneself; extreme selfishness, self-centredness, or self-absorption; (also) an instance of this. Also in neutral sense: isolation, solitude.
“solipsism, n.” OED Online, Oxford University Press, June 2018, www.oed.com/view/Entry/184295. Accessed 31 July 2018.